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JEE Mains · Maths · STD 11 - 4.1 complex nubers

यदि समुच्चय \(R=\{(a, b) ; a+5 b=42, a, b \in \mathbb{N}\}\) में \(m\) अवयव हैं और \(\sum_{n=1}^m\left(1-i^{n !}\right)=x+i y\), जहाँ \(I=\sqrt{-1}\), तो \(m+x+y\) का मान ........... है।

  1. A \(8\)
  2. B \(12\)
  3. C \(4\)
  4. D \(5\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(12\)

Step-by-step Solution

Detailed explanation

\( a+5 b=42, a, b \in N \) \( a=42-5 b, b=1, a=37 \) \( b=2, a=32 \) \( b=3, a=27 \) \( \vdots \) \( b=8, a=2 \) \( R \text { has "8" elements } \Rightarrow \mathrm{m}=8 \) \( \sum_{n=1}^8\left(1-i^{n !}\right)=x+i y \) \( \text { for } n \geq 4, i^{n !}=1 \)…
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